Question about 2003 Pontiac Sunfire

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Service engine light stays on car runs good replaced gas cap per parts store what else could it be?

Also fog lights inop???

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  • Pontiac Master
  • 3,961 Answers

Well, don't guess at it like that, get a readout of the trouble code stored in the car's ECU. Any auto mech can do this for you, and in the USA Autozone as well.

You will find a code like P0135 or some such, and this will have a meaning specific to your car, so you can home in on the fault.

Posted on Mar 22, 2014

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Posted on Jan 02, 2017

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SOURCE: Service engine soon light on

My 2002 pontiac has the exact same problem. I took it to my trustworthy mechanic and he told me that there is three Oxygen sensors in the emissons system. This light came on when one of them went bad. He said it is no big deal to have one go out, however if the second one goes out the car will start missing and running rough. Keep an eye on the performance of your car and if it does not dimenish then you should be alright. Fyi the oxygen sensor costs about $80 plus labor to replace it.

Posted on Dec 18, 2008

  • 2 Answers

SOURCE: service engine soon light on

you need to put it on a computer to find what the code is such as on o2 sensor or a number of other things. once you know the codes you can fix the problem

Posted on Dec 20, 2008

  • 179 Answers

SOURCE: Fog Lamps on 2003 Pontiac Sunfire Not Working

check ground at fog lamps.

Posted on Mar 28, 2009

  • 11 Answers

SOURCE: No start! Help!

the throttle position sensor can cause it to do that

Posted on Sep 21, 2009

Testimonial: "Thanks for the confirmation on the T.P.S. issue no i jus have a few other issues to clear up but at least it runs now! Thanks again!"

  • 14036 Answers

SOURCE: Engine check light comes on and stays on for

IF IT COME ON EVERY TIME YOU GET GAS.GAS CAP HAS BAD SEAL IT MORE LIKELY YOUR PROBLEM BUT LET AUTO ZONE SCAN IT FREE TO SEE WHAT TROUBLE CODE YOU ARE GETTING.

Posted on May 23, 2010

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1 Answer

Gas cap service engine soon light comes and stays on?


Sorry mate, I dont know what this Gas cap is, could be the fuel filler cap, could be the car runs on LPG and it is a cap on the Gas charge line.

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Reset service engine soon light


You have a real auto repair shop ( not auto parts store) look at stored codes, & any freeze frame data
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The gas cap is usually a good suspect in this case, but to figure it out, you need to have your code scanned to figure out what is causing the light. Most auto parts stores will scan it for free, so give them a shot

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Check engine light/gas cap will not stay tight.


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Its an easy enough fix while your there too, just pick up a new gas cap or you could pick up an OEM one from the dealership.

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